Screen



W. M. SCHWARTZ AND F. KERSHAW.

SCREEN.

APPLICATION FILED 0cT.3, I9I9.

Patented Dec. 7, 1920.

2 SHEETS-SHEET I.

I I I l I I I I I l I I I Il T llllIIl IIIIIIIIII IIIIII I.IIIfn/I .,TLIIIIIIIIIIIIIIEIIIIIIIMIJT IIIIIIIIII III I II IIIIIIIIIIIIIIIII :Il rIlIII IIuII I IIII. IIIIIIIIIIIIIII..- IIIIIIIIIIIIIIIIIIIIII 1 UNITED STATES PATENT OFFICE WALTEP. M. SCHWARTZ AND PREDEHICH xEnsHAw, OP PHILADELPHIA, PENNSYL- vANIA, AssIGNoIzs To THE PHILADELPHIA -TEXTILE MACHINERY COMPANY, OP PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

SCREEN.

Specification of Letters Patent.

Patented Dec. 7., 1920.

To all whom t may concern.'

Be 1t known that we, WALTER M. SCHWARTZ and FREDERICK KERSHAW, citlzens of the United States, and residents of Philadelphia,

Pennsylvania, have invented certain Improvements in Screens, of which the following is a specification.

Our invention relates to apparatus for drying materials by the circulation of heated air. tIn such an apparatus the air is laden with light particles of the material being dried.

One object of our invention is to separate the air from the particles by a screen.

A further object of the invention is to provide a movable screen, which. will carry the particles to one side of the air passage at which point they can be removed from the screen.

In the accompanying drawings:

Figure 1 is a side view of one form of dr ing apparatus illustratingour invention;

ig. 2 is a sectional view on the line 2 2, Fie. 1;

Fig. 3 is an enlarged 'sectional view through the screen;

Fig. 4 is a detached perspective view of a portion of the screen; and

Fig. 5 is a view illustrating a modification of the invention.

1 is the drying chamber of an ordinary drying apparatus. 2 is the heating chamber,

in which are coils of pipe, in the present instance, which heat-the air under circulation. In the drying chamber there is a series of endless conveyers 3 for carrying material through the drying chamber. In the present instance, there is one conveyer mounted under another and the material drops from one conveyer to the other, first passing in one direction through the chamber and then in the opposite direction. After being carried through the machine-by the last conveyer, it is discharged from the apparatus.

4, 4 are the circulating fans mounted on shafts 5 adapted to bearings o any suitable t e and' driven in any suitable manner. ese fans circulate the air through the drying chamber and through the heating chamber, as indicated by arrows in Fig. 2.

In drying certain classes of material, small particles of fiber, or other -material carried by the circulating air, are deposited on a screen which, heretofore, has been fixed V so as to prevent the material being deposited on the heating pipes, or other heatung surfaces. This type of screen is objec tionable as the screen` becomes clogged by the particles of material and the circulation of air is seriously interfered with.

By our invention, we provide means by which a clean surface of the screen can be presented and the clogged portions of the screen can be moved to one side and cleaned. Mounted above the heating chamber andA extending over a portion of the drying chamberis a compartment 6, which has an opening 7 communicating with the dryin chamber, and is in communication with t e heating chamber. 9 is'an endless screen band shown clearly in Fig. 4 made, in the prescnt instance, of wire, and having meshes of y a given slze so that while it will allow the given movement, a clean surface is continuously presented so that the air will at all times be free to circulate through the screen.

The small particles of material which adhere to the screen will be carried outside of the drier and will fall oii" of the screen, or may be removed by a doffer 10, of any suitable type. In the present instance, we have shown a brush which rotates in Contact with the screenv and removes the particles. The screen, in the present instance, is endless and passes around sheaves 11 and 12 ada ted respectively to shafts 13 and 14, one of w ich is driven. y

Communicating with the chamber 6, in the resent instance, is a suction pipe 15, in w ich is a suction fan 16 mounted on a shaft 17 in any suitable manner. On the rotation ofthe fan a certain quantityof air is removed from the machine and fresh air is admitted at any suitable points.

In Fig. 5, we have shown a reciprocating screen 9b actuated by a crank 19. -At each side of the chamber 6a is a doil'er 10", which removes material from the under side of the screen. I

While, in Figs. 1 and 2, We have illustrated a given type of drier, it will be understood that the invention can be applied to any type of drier.

- ing chamber and a drying' chamber' and a passage connecting the two chambers 5 a dat screen extending across the inlet of said passage; meansV for moving said screen; and means, outside of the casing, for removing material from'the surface of the screen so that a clean surface is continuously presented to the air passage.

2. The 4combination of a drier having` a drying chamber; a heating chamber; a fan for circulating the air through the. drV ing chamber and the heatingchamber; the d'rivr having a passage formin communication between the two chambers t ro h which air in circulation travels; means or carrying the material to be dried in the drying Chamber; an endless screen extending over the ber; the drier havlng passage and forming communication between the drying chamber and the' heating chamber; and means for removing material accumulating on the screen, said means being located outside of the casing of the drier.

3. The combinationvof a drier having` a drying chamber and fan for circulating air through the chanr a passage forming communication between the two chambers independently of the fan assage means for carrying material through) ber; an endless screen mounted so t at one run of the screen will pass over the opening between the drying chamber and the heating chamber; means for moving the screen; means for removing material that accumulates on the screen, said means being located an exhaust pipe outside of the casing; communicatlng with the space between the two runs of the screen; and an exhaust fan mounted in the pipe so as to draw a certainA amount of air from the machine.

WALTER M. SCHWARTZ. -FREDERICK KERSHAW.

the -dryin chama heating chamber; a 

